| 摘要 |
1,130,060. Transistor amplifiers. PHILCOFORD CORP. 9 Nov., 1967 [9 Nov., 1966], No. 51108/67. Heading H3T. [Also in Division H1] An amplifier comprises a first transistor 10 having an emitter resistor 12 and an input supplied to its base, and a positive signal feedback path including a transistor 28 having its emitter connected to the emitter of transistor 10 and its collector connected firstly to its own base and secondly to the base of transistor 10 through equal resistors 30, 32. The collectors of transistors 10, 28 are connected to a supply terminal 14 through resistors 16 and 34 respectively, and, optionally through a common resistor 18 which stabilizes the current through transistors 10, 28. The positive feedback increases the input impedance of transistor 10 so that a coupling capacitor 26 of small enough size consistent with the monolithic integration of the circuit including components 10, 28, 12, 16, 18, 30, 32, 34 may be used. Transistor 28 compensates for the temperature variation in current through transistor 10. The output of the amplifier may be taken from either the emitter or collector of transistor 10. |
